The It/CL/1939 design: another attempt

After some relative success with very fast ships, I thought that I might try an Italian light cruiser that resembles the Capitani Romani type. The ship has 8-5.3in/45 QF and 8-37mm/54 AA guns. There are also 8-21in TT. The speed that I could attain is just 39 knots. The range is 4200 nm at 15 knots. I wanted to do it without resorting to a deep draft, which is "cheating". This is the Springsharp report:

It/CL/1939, Italy Light Cruisers laid down 1939 (Engine 1950)

Displacement:
 3,482 t light; 3,611 t standard; 3,904 t normal; 4,138 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (466.32 ft / 460.00 ft) x 47.00 ft x (16.00 / 16.59 ft)
 (142.13 m / 140.21 m) x 14.33 m  x (4.88 / 5.06 m)

Armament:
      8 - 5.30" / 135 mm 45.0 cal guns - 75.00lbs / 34.02kg shells, 150 per gun
   Quick firing guns in turret on barbette mounts, 1939 Model
   4 x Twin mounts on centreline ends, evenly spread
  2 raised mounts - superfiring
      8 - 1.46" / 37.0 mm 54.0 cal guns - 1.66lbs / 0.75kg shells, 150 per gun
   Anti-air guns in deck mounts, 1939 Model
   8 x Single mounts on sides, evenly spread
  8 raised mounts
      Weight of broadside 613 lbs / 278 kg
      8 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.497 t each, 11.977 t total
 In 2 sets of deck mounted side rotating tubes

Armour:
   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 1.00" / 25 mm 1.00" / 25 mm  1.00" / 25 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 94,516 shp / 70,509 Kw = 39.00 kts
 Range 4,200nm at 15.00 kts
 Bunker at max displacement = 526 tons

Complement:
 246 - 321

Cost:
 £2.780 million / $11.122 million

Distribution of weights at normal displacement:
 Armament: 154 tons, 4.0 %
    - Guns: 142 tons, 3.6 %
    - Torpedoes: 12 tons, 0.3 %
 Armour: 74 tons, 1.9 %
    - Armament: 74 tons, 1.9 %
 Machinery: 2,128 tons, 54.5 %
 Hull, fittings & equipment: 1,138 tons, 29.1 %
 Fuel, ammunition & stores: 422 tons, 10.8 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   967 lbs / 438 Kg = 13.0 x 5.3 " / 135 mm shells or 0.4 torpedoes
 Stability (Unstable if below 1.00): 1.28
 Metacentric height 2.5 ft / 0.8 m
 Roll period: 12.4 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.44
 Seaboat quality  (Average = 1.00): 1.03

Hull form characteristics:
 Hull has a flush deck,
   an extended bulbous bow and large transom stern
 Block coefficient (normal/deep): 0.395 / 0.404
 Length to Beam Ratio: 9.79 : 1
 'Natural speed' for length: 24.87 kts
 Power going to wave formation at top speed: 68 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 7.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  27.00 ft / 8.23 m,  23.00 ft / 7.01 m
    - Forward deck: 30.00 %,  23.00 ft / 7.01 m,  20.00 ft / 6.10 m
    - Aft deck: 35.00 %,  20.00 ft / 6.10 m,  19.00 ft / 5.79 m
    - Quarter deck: 15.00 %,  19.00 ft / 5.79 m,  19.00 ft / 5.79 m
    - Average freeboard:  21.05 ft / 6.41 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 189.5 %
  - Above water (accommodation/working, high = better): 209.3 %
 Waterplane Area: 13,766 Square feet or 1,279 Square metres
 Displacement factor (Displacement / loading): 76 %
 Structure weight / hull surface area: 45 lbs/sq ft or 218 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.44
  - Longitudinal: 2.06
  - Overall: 0.51
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent